Which validity threat occurs when a study has a drop-out rate of
30%
a. Selection
b. Maturation
c. Testing
d. Mortality
Which validity threat occurs when a study has a drop-out rate of 30% a. Selection b. Maturation c. Testing d. Mortality
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Which validity threat occurs when a study has a drop-out rate of 30% a. Selection b. Maturation c. Testing d. Mortality
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